ESS Monitor running normally, with message "ESS is fully up now". But in DFM status, some devices are learning and questioned. Before this everything is OK, I have 800 devices, suddenly only 2 device with status known. I tried to fix (rediscover), right know there are 9 device questioned and 5 learning. There is some devices in status lerning/questioned. But I couldn't find the devices in my ciscoworks. How it could be?